In 1966, he was forced by the onset of deafness to retire from teaching, and took up the post of Senior Assistant Secretary at the University of Oxford Delegacy of Local Examinations (UODLE) in Oxford - a job he held until his retirement in 1988.

Dexter featured prominently in the BBC programme "How to Solve a Cryptic Crossword" as part of the Time Shift series broadcast in November 2008 in which he recounted some of the crossword clues solved by Morse.

Writing career

He started writing mysteries in 1972 during a family holiday: "We were in a little guest house halfway between Caernarfon and Pwllheli. It was a Saturday and it was raining - it's not unknown for it to rain in North Wales. The children were moaning ... I was sitting at the kitchen table with nothing else to do, and I wrote the first few paragraphs of a potential detective novel." Last Bus to Woodstock was published in 1975 and introduced the world to the character of Inspector Morse, the irascible detective whose penchants for cryptic crosswords, English literature, cask ale and Wagner reflect Dexter's own enthusiasms. Dexter's plots are notable for his use of false leads and other red herrings.

The success of the 33 episodes of the TV seriesInspector Morse, produced between 1987 and 2001, brought further acclaim for Dexter. In the manner of Alfred Hitchcock, he also makes a cameo appearance in almost all episodes.[1] More recently, his character from the Morse series, the stalwart Sgt (now Inspector) Lewis features in 12 episodes of the new ITV series Lewis. As with Morse, Dexter makes a cameo appearance in several episodes.[2]